Knee pain caused by osteoarthritis and other joint conditions can make everyday activities such as walking, climbing stairs, standing, and getting up from a chair increasingly difficult. When non-surgical treatments no longer provide adequate relief, total knee replacement surgery may be considered.
Despite advances in surgical techniques and implants, many people delay treatment because of concerns about pain, recovery time, age, cost, or how long an artificial knee will last.
Understanding the facts about total knee replacement can help patients make informed decisions with their orthopaedic specialist. Here are some common myths and the facts behind them.
Myth 1: Knee Replacement Surgery Has a Low Success Rate
Fact: Total knee replacement is an established treatment for advanced knee arthritis and other conditions that severely damage the joint.
Many patients experience significant pain relief and improved mobility after surgery. However, outcomes vary depending on factors such as the patient’s health, the severity of joint damage, surgical factors, and rehabilitation.
The aim is to reduce pain and improve the ability to perform everyday activities. Results cannot be guaranteed for every patient.
Myth 2: Knee Replacement Surgery Should Be Delayed as Long as Possible
Fact: Surgery does not need to be postponed until knee pain becomes unbearable.
The decision to undergo knee replacement depends on pain severity, joint damage, limitations in daily activities, and the response to non-surgical treatment.
Delaying surgery may be reasonable when symptoms remain manageable. However, unnecessary delay when symptoms are severe can prolong discomfort and reduce mobility. The appropriate timing should be discussed with an orthopaedic surgeon.
Myth 3: Medicines Should Be Continued Indefinitely to Avoid Knee Replacement
Fact: Medicines can help manage knee pain, but they do not reverse advanced osteoarthritis or restore severely damaged joint surfaces.
Depending on the condition, treatment may include medication, exercise, physiotherapy, weight management, and other non-surgical approaches. Some pain-relieving medicines can also cause side effects, particularly with prolonged use.
If these measures no longer provide sufficient relief and knee pain significantly affects daily life, an orthopaedic specialist may discuss knee replacement as an option.
Myth 4: Knee Replacement Is Only for Elderly People
Fact: Age alone does not determine whether someone needs knee replacement surgery.
Although the procedure is common among older adults, some younger patients may also require it because of severe osteoarthritis, rheumatoid arthritis, or significant joint damage following an injury.
The decision depends on the extent of joint damage, symptoms, overall health, and expected benefits and risks of surgery.
Myth 5: Older People Should Avoid Knee Replacement Because of Their Age
Fact: Being elderly does not automatically make someone unsuitable for knee replacement.
The patient’s overall health, heart and lung function, mobility, other medical conditions, and ability to undergo anaesthesia and rehabilitation are important considerations.
A thorough preoperative assessment helps the medical team evaluate the risks and determine whether surgery is appropriate for an individual patient.
Myth 6: Knee Replacement Will Limit My Activities
Fact: One of the main goals of knee replacement is to reduce pain and improve mobility.
Many patients find it easier to walk, stand, climb stairs, and perform routine activities after recovery. However, the level of improvement varies, and some activities may remain difficult.
A suitable rehabilitation programme and realistic expectations are important for achieving the best possible functional outcome.
Myth 7: Recovery Always Takes Several Months Before I Can Walk
Fact: Recovery begins soon after surgery, but the time needed to regain independence varies from person to person.
Many patients are encouraged to stand and walk with assistance within a day of surgery, when medically appropriate. Progress with walking, bending the knee, using stairs, and returning to daily activities depends on pain control, strength, balance, and overall health.
Some activities may resume within a few weeks, while further improvements in strength and mobility can continue for several months. Follow your surgeon’s instructions rather than relying on a fixed recovery timeline.
Myth 8: Knee Replacement Surgery Is Extremely Painful
Fact: Some pain and discomfort are expected after knee replacement, but modern anaesthesia and pain-management techniques help control it.
The medical team may use a combination of medicines and other pain-relief methods to improve comfort during recovery. Pain levels differ between patients, and effective pain management helps them participate in early movement and rehabilitation.
Discuss any concerns about postoperative pain with your surgeon and anaesthesia team before the procedure.
Myth 9: Driving Is Impossible After Knee Replacement
Fact: Many patients return to driving after recovering sufficiently from surgery.
The timing depends on which knee was operated on, pain levels, strength, mobility, reaction time, and whether the patient has stopped taking medicines that impair driving.
Before returning to driving, patients should be able to control the vehicle safely and should obtain clearance from their treating healthcare professional. A fixed timeline does not apply to everyone.
Myth 10: People With Obesity Cannot Undergo Knee Replacement
Fact: Obesity does not automatically rule out knee replacement surgery, but it can affect surgical risks and recovery.
Higher body weight can increase stress on the knee joint and may be associated with a greater risk of certain complications. The orthopaedic team considers the patient’s overall health, degree of joint damage, and individual risk factors.
Weight management may be encouraged where appropriate, but severe knee pain can also make exercise difficult. Patients should discuss a realistic treatment and activity plan with their healthcare team rather than assuming surgery is impossible.
Myth 11: People With Diabetes, High Blood Pressure, or Heart Disease Cannot Have Knee Replacement
Fact: These conditions do not automatically make knee replacement unsuitable.
However, they require careful evaluation and appropriate management before surgery. For example, poorly controlled blood sugar can increase the risk of infection and wound-healing problems, while uncontrolled blood pressure or certain heart conditions may increase anaesthesia and surgical risks.
A preoperative assessment helps the medical team identify concerns and optimise the patient’s health before deciding whether surgery can proceed safely.
Myth 12: A Replaced Knee Lasts Only 8–10 Years
Fact: Modern knee implants can last many years, and many continue to function well beyond 10 years.
Implant longevity depends on factors such as implant design, surgical technique, activity levels, body weight, and the patient’s overall health. Some implants may eventually wear out or loosen and require further treatment.
No implant can be guaranteed to last a specific number of years or for the patient’s entire lifetime. Your surgeon can explain the expected longevity and follow-up requirements for your situation.
Myth 13: Both Knees Cannot Be Replaced During the Same Operation
Fact: In selected patients, both knees can be replaced during the same operation. This is known as simultaneous bilateral knee replacement.
However, operating on both knees at once is not suitable for everyone. It may involve greater physiological demands and different risks compared with replacing one knee at a time.
The decision depends on the patient’s overall health, anaesthesia risk, age, other medical conditions, and rehabilitation support. The surgeon and anaesthesia team can help determine which approach is most appropriate.
Myth 14: Knee Replacement Cannot Be Repeated
Fact: A knee replacement can sometimes be revised if the original implant develops problems.
Revision knee replacement may be needed because of implant wear, loosening, infection, instability, or other complications. The procedure is generally more complex than the initial replacement, and its suitability depends on the cause of the problem and the patient’s health.
Not every painful artificial knee requires revision surgery. A specialist assessment is needed to identify the cause and discuss treatment options.
Myth 15: The Entire Knee Is Removed During Knee Replacement
Fact: Total knee replacement does not involve removing the entire knee.
During the procedure, the surgeon removes damaged cartilage and a small amount of underlying bone from the affected joint surfaces. These surfaces are then covered with artificial components designed to restore joint function.
The procedure is therefore a reconstruction of the joint surfaces rather than the removal and replacement of the entire knee.
Myth 16: Long-Term Physiotherapy Is Always Necessary After Knee Replacement
Fact: Rehabilitation is an important part of recovery, but the programme and its duration vary between patients.
Exercises help improve knee movement, strengthen the surrounding muscles, restore balance, and support walking. Some patients may progress with a home exercise programme, while others benefit from supervised physiotherapy for a longer period.
Following the rehabilitation plan recommended by the treating team can help patients regain function and manage stiffness. Do not stop prescribed exercises simply because the knee begins to feel better.
Conclusion
Total knee replacement can help selected patients with advanced knee arthritis or severe joint damage reduce pain and improve mobility. However, the decision to undergo surgery should be based on symptoms, medical assessment, overall health, and the benefits and risks for the individual patient.
Understanding common myths can help patients have more informed discussions with their orthopaedic specialist. If knee pain is affecting your daily activities and other treatments are no longer providing sufficient relief, seek a professional assessment to understand the available options.